reactos/drivers/filesystems/ext2_new/src/nls/nls_utf8.c

   1 /*
   2  * Module for handling utf8 just like any other charset.
   3  * By Urban Widmark 2000
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/kernel.h>
   8 #include <linux/string.h>
   9 #include <linux/nls.h>
  10 #include <linux/errno.h>
  11
  12 static unsigned char identity[256];
  13
  14 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
  15 {
  16     int n;
  17
  18     if ( (n = utf8_wctomb(out, uni, boundlen)) == -1) {
  19         *out = '?';
  20         return -EINVAL;
  21     }
  22     return n;
  23 }
  24
  25 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
  26 {
  27     int n;
  28
  29     if ( (n = utf8_mbtowc(uni, rawstring, boundlen)) == -1) {
  30         *uni = 0x003f;  /* ? */
  31         n = -EINVAL;
  32     }
  33     return n;
  34 }
  35
  36 static struct nls_table table = {
  37     /* .charset */ "utf8",
  38     /* .alias */   0,
  39     /* .uni2char */ uni2char,
  40     /* .char2uni */ char2uni,
  41     /* .charset2lower */ identity,      /* no conversion */
  42     /* .charset2upper */ identity,
  43     /* .owner */ THIS_MODULE,
  44 };
  45
  46 static int __init init_nls_utf8(void)
  47 {
  48     int i;
  49     for (i=0; i<256; i++)
  50         identity[i] = (unsigned char) i;
  51
  52     return register_nls(&table);
  53 }
  54
  55 static void __exit exit_nls_utf8(void)
  56 {
  57     unregister_nls(&table);
  58 }
  59
  60 module_init(init_nls_utf8)
  61 module_exit(exit_nls_utf8)
  62 MODULE_LICENSE("Dual BSD/GPL");